I think your design with 3 VCO on the same PCB is interesting for me. I would like to use it to create string pads or brass leads and for that purpose saw and square waves are ok. And if your design is based on a saw oscillator it would be easy to add as many waveshaper we want on extra pcbs. What really matters is the detune automation... If I don't misunderstood what you described, I could dare to summeries it this way:

- 1 Hz detune between 2 oscillators (for instance 440 Hz and 881 Hz) stays 1Hz if I play an A5 (we have then respectively 880 Hz and 1761 Hz on both VCOs)

That will be one of its features indeed.

JH.

Now playing: Brian Eno, Music for Films_________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

The result of the poll point at the cheaper 3 VCO model with less waveforms. A suggestion for wave selection could be the stepless variable saw/pulse waveshaper used on MOTM-310 and Micromoog/Multimoog. Maybe that´s more complicated than the toggle on the JH5, but it´s the solution Moog choosed for their budget Micromoog. It´s a nice function and I assume that it could make the living VCO even more living Last edited by Electronicant on Tue Jan 27, 2009 10:30 pm; edited 1 time in total

It's going to happen.
I've been working some hours on this today.
It will be 3 VCOs on one PCB.
I start with the core parts, and then see what else will fit on the board.

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

2 vco's on one pcb is ideal Juergen,but would be perfect if u just could add sine for both 2 on the pcb

I also vote for SINE out ... there're relatively few modules outtputting sinewaves

thanks!

aero

No sine waves - sorry.
There is only so much I can put on a single PCB, and I decided to put 3 VCO cores there, plus a discrete PWM circuit per VCO, just like the JH-5 has.

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

Here's a little preview of what I'm working on.
Looks like I can indeed put 3 VCOs plus an Oscillator Driver on a single board! This may get very close to the whole oscillator section of my JH-5, just on a single 160mm * 100mm PCB.

JH.

living_preview.jpg

Description:

Filesize:

241.72 KB

Viewed:

184 Time(s)

This image has been reduced to fit the page. Click on it to enlarge.

jh5_total_large.jpg

Description:

Filesize:

377.94 KB

Viewed:

209 Time(s)

This image has been reduced to fit the page. Click on it to enlarge.

_________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

Just finished PWM section of one channel.
PWM will be all discrete - no opamps in here!

Also, PWM works like in the CS-80: You can heavily overmodulate it without loosing the signal!

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

I will purchase two PCB sets at least regardless, but was wondering what tracking accuracy you were shooting for?

For outputs, there will be a PWM amd sawtooth as in the JH-5, right?

Thanks for your efforts and for sharing your skill and talent.

David

Tracking: decent. Good enough for a mono synth. No efforts to get ultimate precision.

PWM and saw, yes.

JH._________________"I tell you the truth, if anyone says to this mountain, 'Go, throw yourself into the sea,' and does not doubt in his heart but believes that what he says will happen, it will be done for him. Therefore I tell you, whatever you ask for in prayer, believe that you have received it, and it will be yours." (Mk 11,23f)

You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forumYou cannot vote in polls in this forumYou cannot attach files in this forumYou can download files in this forum

Please support our site. If you click through and buy from our affiliate partners, we earn a small commission.